Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f09e656cac9dc65470efdae118f043b5d2e594bb798ae80516906c56185b359' 
  AND token = '3YluYtWoBM4YI8dc4FkS72DIp0vCm9OJE2usuxClDMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}